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Finding the Fourth Proportional to 1,028.72, 1,542.14 and 412.32

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Solution

The fourth proportional to 1,028.72, 1,542.14 and 412.32 is: 618.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.72 : 1,542.14 = 412.32 : x
  2. Step 2: Convert to fraction form
    1,028.72/1,542.14 = 412.32/x
  3. Step 3: Cross multiply
    1,028.72x = 1,542.14 × 412.32
  4. Step 4: Simplify right side
    1,028.72x = 635,855.16
  5. Step 5: Solve for x
    x = 635,855.16/1,028.72
  6. Step 6: Final answer
    x = 618.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.